Safety gas-burner.



B. MAETELLI.

SAFETY GAS BURNER.

APPLICATION FILED JUNE 23, 1908.

Patented May 18, 1909.

mommy the closed ,holding open, by but BERNARDO MARTELLI, on NEW YORK, N. Y.

SAFETY GAS-BURNER.

Specification of Letters Patent.

Patented May 18, 1900.

Application filed June 23, 1908. Serial No. 439,891.

To all whom it may concern:

Be it known that I, BERNARDO MARTELLI,

a citizen of the United States, residing in the boron h of Manhattan, city and State of New ork, have invented a certain new and useful Improvem nt in SafetyZGas-Burners; and I do hereby declare that the following is a full and exact description thereof. The im rovement relates to means for insuring that the gas will be automatically shut off when through 'any cause as mistaken operations or a gust of wind the flame is extinguished. It relies like man previous efforts by myself and others on t 1e unequal expansion and contraction of different metals with heat and cold.

The present invention involves means whereby the spring force which is relied on to shut off the gas when the flame is extinguished maintains its action with more instead of less force as the cock is turned into position, and the necessity of waiting unti the parts have become heated is avoided.

It also involves improved means for engagin the automatic cock with the holding and li crating means. The En dish patent to Plunket of 1884 showed a p ploying two teeth on the lever of the auto matic cook, the first holding this cock open temporarily a few seconds when iii-st lighted and the second holding it open for as long a period as may be required. The first is subordinate to t e second and soon transfers its charge to the second tooth. The first tooth is important in relieving the o v erator from the labor of standing and waitin for the compound bar to become hot. here are objections to his manner of working out the idea. I have devised a construction which is better, in that it avoids the lost motion and allows of being adjusted to work more cer tainly and more rapidly with small movements of'the thermostat.

I rovide a finger carried directly on a slen er thermostatic bar mounted alongside the gas flame, and mount the two teeth arranged much like Plunkets, on the lever, not of the main cock but of a second cock which may be fitted to turn very easily. The absence of lost motion makes it practicable to effect the first liberation and the proper a very small amount of sinking motion induced by the heating, and

to effect the second liberation and the instant closing of the cock by but a very small an for em-,

amount of rising motion due to the cooling when the gas is accidentally extingi lhed.

The following is a description of what I consider the best means of carrying out the invention.

The accompanying drawings form a part of this specification.

Figure 1 is a face view with the automatic cock closed and all the arts cold. Fig. 2 is a corresponding view with gas freshly turned on by pulling the chain,'the ordinary cock having been opened at any convenient period earlier, and Fig. 3 is a corresponding view at a later stage, after the metal has been so heated by the gas flame not shown, a fish-tail or similar fiat flame alongside, as to induce the assum tion by the cock of the final position for e icient use giving light. Fig. 2 is a face view of a small portion correspondin to Fig. 2 but on a larger scale. El

Figs. 4 an 5 show a modification adapted to attain a greater extent of the movement due to the heat. The parts not shown in these figures may be the same as in Figs. 1, 2 and 3. Fig. 4 is a face view and Fig. 5 is an edge view.

Similar letters of reference indicate like parts in all the figures where they appear.

A is a gas burner of any ordinary or suitable style adapted to screw tightly on the end of a gas pipe extending up from below.

B is the ordinary cock opened and closed by hand as usual.

D is a cock sup )lementary thereto.

My invention re ates to the means of holding open and of closing this supplementary cock while the ordinary cock B is set wide open.

A is a pm which serves to limit the movements as will be obvious, and A is an arm fixed rigidly on A. to the outer end of which is. attached a slender helical contracting spring E which extends therefrom across the front of the burner. The .parts. are so arranged that when the cock is open the spring crosses nearly or quite in contact with the extended end of the cock D.

G is a short horizontal finger triangular in cross section moved to a small extent up and down by thechanges which occur when the gas is ignited and exinguished. It is carried on a compound arm G fixed adjustably on the burner A. This arm is shown as curved about half a circle in Fi s. 1, 2 and 3, and as curved in several comp ete circuits in the modification, Figs. 4 and 5. The moits increased leverage.

remains engaged with the lever,

rise but not sufiicient.

is downward, and it soon assumes a temporary position lower than before. This effect is 'due to the superior expansion of the copper, increasing the curvature of the arm G. When the parts thus previously heated are subjected to the cooling which follows an extinguishment of the flame, the linger G rises by the superior contraction of the outer side inducing an uncoiling of the compound arm G and a consequent rise of G This rising and sinking of the finger G determines the holding or releasing of the supplementary cock D by the following means:

A eculiarly sha ed piece of stout sheet metafis fixed on th cock D and controls its position. I will mark it as a whole D and designate its several parts by further su ernumerals. I

D is a pin indicate by dotted lines to which one end of the contracting s iring E is attached. This pulls the lever tov the right which gives the closed position of the cock D. The arrangement causes the linc'of tension of this spring to extend so near the cock D when most extended that its force is nearly radial to the cock D. See Figs-2 and,

3. Its tension is then greater but. its efi'ect in turning the cock is less than in otherpositions. When the lever D is allowed to yield to the spring E'and turn farto the right, thus inducing the closed position of the cock D, the. spring E is raised as shown in Fig. 1. In this position its tension is less by its having shortened itself, but its effect in turning the cock D is greater by reason of I An eye D serves as a means of attaching a chain F which may extend down any distance to be conveniently reached by an operator below. Pulling this chain turns D to the left and opens the cock D. Short arms D and D below make con,- tact respectively with the fixed pin A and limit the extent of the motions.

Sprmgs increase -1n tenslon as they are strained. The grip of the slightly risingand sinking finger G on the lever must be delicate. .The com ound arm G" is long and springy and the I ger, if there is much force turning the lever is liable to retain its hold by friction, or more properly traction, and the cooling having induced a tendency in the finger to 11' to avoid this,'the

spring which urges-the lever to turn into the close position as heretofore arranged is e projecting end of themade very gentle, the weakening which always occurs when it is yielded to, is liable to 'makeit lack force and as the weight of a good portion of the lever and all of the chain (in the simplest arrangement, shown) lies on the other side oi the'eenter of motion, 'the lever is liable to stop before completing its closing motion which would be a very serious evil. My spring E is long and its tension is consequently nearly equal in all iositionsfi Its arrangement to pull nearly ra iially when the cock is open insures that the turning force shall be slight when the cock is delicately held open by the linger G and therefore the linger can rise with very slight iesistance and release the lever, and its arrangement to pull nearly tangentially when the cock approaches its closed; position insuresthat the only slightly diminished force of the spring shall not then with such increasedlevera e that it can certainly and always completely close the cock.

The form of the parts at the up er angle oi? the lever D is important and ena les the device to serve with marked advantage over any before known to me. A tooth D is favorably located to engage with the finger G when the gas has been so long burning as to cause the compound arm to be lully heated, in other words when the finger G is in its most depressed position. While the gas is burning for long periods, the cock D is held open reliably l y the engagement of this tooth D with the finger G". If, from any cause, the gas flame is extinguished while these parts are in this position, the cockD will remain open and the gas will continue to flow without being i nited, but it will thus escape unburned am oison. the air only a few seconds. The cooling of the arm G" in: ducing a rise of the finger G? will presently lift it above the point of the tooth D. When this occurs, thev spring E will assert itself and turn the lever D to the rightand close the cock. The action thus far is old.

I) is a tooth carried on the lever D b a circuitous connection as shown. The eft side of this tooth is beveled as shown, the right side issquare. The tooth is located just sufiicien tly the right of the tooth D to serve as an important auxiliary. When with the parts in the cold condition, with a lighted match. in position to eflect the igniting as usual, the chain F is pulled and thelever D is swung to the left, the tooth D -moves across idly under touches it at all, it is a gentle touch and performs no function. By the further motion of the lever D the tooth D is brought into action. It moves across over the finger G pressing down ently thereon, the finger or the toothor bot yielding a little elastically, and as soon. as the toothhas quite assed it above and just sufficiently to thefinger G without touching it, or if it snaps down into engagement with t e finger g. The chain E may be released at leisure, or immediately as convenience or whim may render preferable, and the lever D will re- The operator may give care to other matters, no further 1 care is required. anism is not yet completed. The finger G remains enga ed with the tooth D only a short time. be soon as the curved arm G is sufficiently heated it depresses the finger Gt out of contact. with the tooth D When thissst age occurs, the lever D will be lll)0latedgflftom the tooth G and will turn to the right in obedience to the force of the spring E, but it will move but a little distance before the tooth'D will engage with the finger, and now the parts are in the properly engaged position ready for prolonged service without any further changes.

On shutting off the gas the parts automatically assume their correct posit-ions ready to serve again. First the gas is shut off by the other cock B and the flame is extinguished. So soon thereafter asthe arm G has cooled enough to again raise the finger G out of the path of the tooth G, the lever D makes its proper full movement to the right in obedience to the strong final effect 01' the spring E, and all the arts are in position for indefinite rest., n reparing {or further use when occasion sha require, care must be taken to turn the cock B into the open position.

The mounting of the arm G on the burner A is accomplished by making it integral with But the work of the mecha clamp G sul'iicicntlv stout which embraces the barrier A and is tightened in its grip by a screw extending through lugs adjacent to the joint. Fig. In assembling the parts this screw H may be partially tightened and the clamp This construction is ind' *ated in G and its attachments moved up and do n to small extents by gentle percussion. When it is found that the finger is just the right height, the screw 11 may be further tightened and the clamp secured firmly.

Modifications may be made'w'thout departing from the principle. or sacrificing the advantages of thednvention.

Figs. 4 and 5 show a modification which may be important by giving an increased extent ofmotion up and down to the linger G".

I claim as my invention:

In safety gas cock mechanism an auto matieally closing stop-cock having a lever with two teeth, one D projecting outward and the other 1) tively to the axis 0 motion out of line with each other in combination with a finger G carried on a thermostat coil G exposed to the heat by the side of the gas flame and raised and lowered by the expansion and contraction of such thermostat coil by heating and cooling. arranged to engage with the teeth in succession. i

Signed at New York, New York this 22 day of June 1008.

BERVARDO MARTELLI.

WVitnesses: ARTHUR P. MARE, THOMAS DREW STETSON.

projecting inward, rela-- 

